\documentclass[a4paper]{book}
\usepackage{amssymb,amsmath}
\usepackage[T1]{fontenc}
\usepackage[latin1]{inputenc}
\usepackage{graphicx}
%\graphicspath{{:Figure_Choice:}}
\usepackage[english,polutonikogreek,italian]{babel}

\providecommand{\boldsymbol}[1]{\mbox{\boldmath $#1$}}
\begin{document}

\include{Corda1}
\include{Fourier}
\include{campi}
\include{solidi}
\include{Reticoli}
\include{calore}
\include{potterm}
%\include{Fluidi}

\end{document}
